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The new double many-body expansion (DMBE) form has been fitted to a wealth of ab initio points that have been calculated at the multi-reference configuration interaction level using the full-valence-complete-active-space wave function as reference and the cc-pVQZ basis set, and subsequently corrected semiempirically via double many-body expansion-scaled external correlation method to extrapolate the calculated energies to the limit of a complete basis set and, most importantly, the limit of an infinite configuration interaction expansion. The topographical features of the novel potential energy surface are then examined in detail and compared with corresponding attributes of other potential functions available in the literature. Exploratory trajectories have also been run on this DMBE form with the quasiclassical trajectory method, with the thermal rate constant so determined at room temperature significantly enhancing agreement with experimental data.<\/jats:p>","DOI":"10.1063\/1.4893951","type":"journal-article","created":{"date-parts":[[2014,9,2]],"date-time":"2014-09-02T14:27:35Z","timestamp":1409668055000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":12,"title":["Accurate double many-body expansion potential energy surface for the 21<i>A<\/i>\u2032 state of $\\rm N_2O$N2O"],"prefix":"10.1063","volume":"141","author":[{"given":"Jing","family":"Li","sequence":"first","affiliation":[{"name":"Universidade de Coimbra Departamento de Qu\u00edmica, 3004-535 Coimbra, Portugal"}]},{"given":"Ant\u00f3nio J. 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